MainWindow.glade (Código)

<?xml version="1.0" encoding="UTF-8"?>
<!-- Generated with glade 3.38.2 -->
<interface>
    <requires lib="gtk+" version="3.24"/>
    <object class="GtkApplicationWindow" id="MainWindow">
        <property name="can_focus">False</property>
        <property name="title" translatable="yes">Gtk.ButtonBox</property>
        <property name="default_width">683</property>
        <property name="default_height">384</property>
        <property name="icon">../../../assets/icons/icon.png</property>
        <child>
            <placeholder/>
        </child>
        <child>
            <object class="GtkBox" id="box_vertical">
                <property name="visible">True</property>
                <property name="can_focus">False</property>
                <property name="border_width">12</property>
                <property name="orientation">vertical</property>
                <property name="spacing">12</property>
                <child>
                    <object class="GtkButtonBox">
                        <property name="visible">True</property>
                        <property name="can_focus">False</property>
                        <child>
                            <object class="GtkButton" id="btn_1">
                                <property name="label" translatable="yes">Botão 1</property>
                                <property name="visible">True</property>
                                <property name="can_focus">True</property>
                                <property name="receives_default">True</property>
                            </object>
                            <packing>
                                <property name="expand">True</property>
                                <property name="fill">True</property>
                                <property name="position">0</property>
                            </packing>
                        </child>
                        <child>
                            <object class="GtkButton" id="btn_2">
                                <property name="label" translatable="yes">Botão 2</property>
                                <property name="visible">True</property>
                                <property name="can_focus">True</property>
                                <property name="receives_default">True</property>
                            </object>
                            <packing>
                                <property name="expand">True</property>
                                <property name="fill">True</property>
                                <property name="position">1</property>
                            </packing>
                        </child>
                    </object>
                    <packing>
                        <property name="expand">False</property>
                        <property name="fill">True</property>
                        <property name="position">0</property>
                    </packing>
                </child>
                <child>
                    <object class="GtkButtonBox" id="btn_box_2">
                        <property name="visible">True</property>
                        <property name="can_focus">False</property>
                        <property name="layout_style">expand</property>
                        <child>
                            <object class="GtkButton" id="btn_3">
                                <property name="label" translatable="yes">Botão 3</property>
                                <property name="visible">True</property>
                                <property name="can_focus">True</property>
                                <property name="receives_default">True</property>
                            </object>
                            <packing>
                                <property name="expand">False</property>
                                <property name="fill">False</property>
                                <property name="position">0</property>
                            </packing>
                        </child>
                        <child>
                            <object class="GtkButton" id="btn_4">
                                <property name="label" translatable="yes">Botão 4</property>
                                <property name="visible">True</property>
                                <property name="can_focus">True</property>
                                <property name="receives_default">True</property>
                            </object>
                            <packing>
                                <property name="expand">False</property>
                                <property name="fill">False</property>
                                <property name="position">1</property>
                            </packing>
                        </child>
                    </object>
                    <packing>
                        <property name="expand">False</property>
                        <property name="fill">True</property>
                        <property name="position">1</property>
                    </packing>
                </child>
                <child>
                    <object class="GtkButtonBox" id="btn_box_3">
                        <property name="visible">True</property>
                        <property name="can_focus">False</property>
                        <property name="orientation">vertical</property>
                        <property name="layout_style">start</property>
                        <child>
                            <object class="GtkButton" id="btn_5">
                                <property name="label" translatable="yes">Botão 5</property>
                                <property name="visible">True</property>
                                <property name="can_focus">True</property>
                                <property name="receives_default">True</property>
                            </object>
                            <packing>
                                <property name="expand">True</property>
                                <property name="fill">True</property>
                                <property name="position">0</property>
                            </packing>
                        </child>
                        <child>
                            <object class="GtkButton" id="btn_6">
                                <property name="label" translatable="yes">Botão 6</property>
                                <property name="visible">True</property>
                                <property name="can_focus">True</property>
                                <property name="receives_default">True</property>
                            </object>
                            <packing>
                                <property name="expand">True</property>
                                <property name="fill">True</property>
                                <property name="position">1</property>
                            </packing>
                        </child>
                    </object>
                    <packing>
                        <property name="expand">False</property>
                        <property name="fill">True</property>
                        <property name="position">2</property>
                    </packing>
                </child>
            </object>
        </child>
    </object>
</interface>